General stupidity at the Superstore

I am a 19 year old student who works part time at a Real Canadian Superstore. For those that are unfamiliar with the Loblaws chain, it's a super market. For over a year we have had some Self Serve Checkouts. The damn things are horrible, codes missing for produce, a carousel scale that you must put your items on or it gets pissed and won't let you continue. But it's not this that is the real issue, these things actually work fine most of the time, save for when people's kids are climbing on the machine, or one of them is fiddling around with the items on the carousel, and no matter how many times you tell them that they can't do that, they continue. The ultimate in ignorance and stupidity, however, are found when they cannot follow simple instructions laid out by either the machine, or the lane sign (the sign that tells you what checkout you are using) None of our selfscans are numbered where a customer can see it, the lane signs simply read "Self Scan - 25 items or less," which seems to make people think that they are on lane 25. This becomes apparent if I were to ask them, for whatever reason, which selfscan they are using, they always respond 25. This is akin to the other sign that shows that they cannot read, that sign is when they come to selfscan with more than 25 items, and I don't mean "oops I had 30, sorry" types, no, I mean "Oops, I guess 60 items is a little too much, I ran out of room on the carousel."

Not only can they not read, but they also cannot listen, that is, if the machine is telling them something, the instant I say the exact same message, they get it. Best example is if the machine gives them bills with their change. The machine will beep loudly twice, then shout "Don't forget to take your cash located below the scanner" followed by another two beeps, and the messages again, complimented with a picture onscreen of what they should look for. Most people get it, but every shift, I have at least five people either ask me "Where are my bills, it only game me coins (while they stare at the bill acceptor which is nowhere near the cash slot)" or "this machine shortchanged me! [enter proclamation of store's suckiness here]." I of course follow up and say "Your cash is located below the scanner," and all of a sudden they look below the scanner where, low and behold, they're bills are just waiting to be picked up.

I'm pissed and tired, thanks for reading, don't be like those I have to deal with every day.